Mg-based metallic glass matrix composite with in situ porous titanium dispersoids by dealloying in metallic melt

Hideki Oka, Wei Guo, Takeshi Wada, Hidemi Kato

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A Mg3Cu3Gd bulk metallic glass matrix composite with porous α-Ti dispersoids was prepared by dealloying in a metallic melt. The in situ formed α-Ti dispersoids had a pore-size of ~500nm, which was imparted from the Ti2Cu precipitate in the prealloy. Pore size was therefore controllable through the cooling rate of the prealloy preparation. Plasticity was not improved apparently, however the maximum fracture stress under four point bending mode increased from 217MPa for the monolithic counterpart to 387MPa. This was due to the optimal relationship where dispersoid size (L)≈dispersoid interval distance (S)≈process zone size (Rp). This was achieved locally within and around the porous Ti dispersoids, and helped improve the toughness and ductility.

Original languageEnglish
Pages (from-to)76-83
Number of pages8
JournalMaterials Science and Engineering A
Volume582
DOIs
Publication statusPublished - 2013 Oct

Keywords

  • Bulk metallic glass
  • Composite material
  • Dealloying
  • Mg-based alloy
  • Porous metal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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